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Finding the Fourth Proportional to 738.36, 1,019.76 and 668.40

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Solution

The fourth proportional to 738.36, 1,019.76 and 668.40 is: 923.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.36 : 1,019.76 = 668.40 : x
  2. Step 2: Convert to fraction form
    738.36/1,019.76 = 668.40/x
  3. Step 3: Cross multiply
    738.36x = 1,019.76 × 668.40
  4. Step 4: Simplify right side
    738.36x = 681,607.58
  5. Step 5: Solve for x
    x = 681,607.58/738.36
  6. Step 6: Final answer
    x = 923.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.